Fast, sharp and great zoom. The Build is solid. It is the only 3rd party lens I own with 18 other Nikons and it is a decision I am glad I made.

Cons:

Some complain it is heavy. It is lighter then most of the Nikon 300 mm F2.8 AF models and cost much less then the newer AF-S series? I have one fear getting it wet as Sigma recommends it is not water resistant. Can't have everything?

I use the APO 1.4x teleconverter. I find it fast and accurate even with the teleconverter. Thus far it performs outstanding. Would recommend it to anyone who wants a lens that performs without breaking the bank. When I first tried it out it was priced at 1,899 so I brought the 70-200 F 2.8 AFS VR G by Nikon instead.Since then Sigma has raised the price and it sells for $2,299. I was Fortunate to find it on E-bay at 1,400 in mint condition so now I have the best of two worlds so to speak. For outdoor sports the 70-200 is placed on a second body. The Sigma 120-300 rules for soccer, baseball and football.